Reed Block Gasket – Fits Mercury Marine 40-60 HP (Replaces 27-812868)

$10.96

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Free standard shipping on all orders under 1 KG

If you have any questions, feel free to email us at info@sierramarines.com, and we’ll get back to you within 20–36 hours.

Product Details

This precision-cut Reed Block Gasket is engineered for a perfect fit on Mercury Marine 3-cylinder, 2-stroke engines from 40 to 60 HP, covering models from 1998 through 2009. It ensures a reliable seal for the reed block assembly, restoring engine performance and efficiency.

It serves as a direct cross-reference for OEM part Mercury Marine 27-812868 and aftermarket equivalent GLM Marine 36900.

Installs to OEM specifications for a guaranteed fit.
Constructed from durable, high-grade gasket material to prevent leaks.
Genuine Mercury Marine factory OEM part ensuring quality and compatibility.

Part Number Matrix

Use this matrix to confirm equivalent references across OEM and aftermarket.

Brand	Part Number	Notes
Mercury Marine	27-812868	OEM
GLM Marine	36900	Aftermarket

Engine & Model Compatibility

Confirm your engine model/year in the table below.

For Mercury Marine owners, please verify your engine's serial number falls within the ranges specified in the 'Notes' column to ensure an exact match.

Brand	Model	Rated HP	Stroke	Years	OEM Part No.	Notes
Mercury Marine	30 JET	30	2-Stroke	2000–2004	27-812868	Serial ranges: 0G590000-0G760299, 9973100-0P016999
Mercury Marine	30 JET	30	2-Stroke	2004–2005	27-812868	Serial ranges: 0G760300-0T408999, 0P017000-0P153499
Mercury Marine	40	40	2-Stroke	2000–2004	27-812868	Serial ranges: 0G590000-0G760299, 9973100-0P016999
Mercury Marine	40	40	2-Stroke	2004–2006	27-812868	Serial ranges: 0G760300-0T979999, 0P017000-0P325499
Mercury Marine	40	40	2-Stroke	2006–2009	27-812868	Serial ranges: 0P325500 & Up, 0T980000-1B209735
Mercury Marine	40 JET	40	2-Stroke	2005–2006	27-812868	Serial ranges: 0T178500-0T979999, 0P094500-0P325499
Mercury Marine	40 JET	40	2-Stroke	2006–2009	27-812868	Serial ranges: 0P325500 & Up, 0T980000 & Up
Mercury Marine	45 JET	45	2-Stroke	1998–2000	27-812868	Serial ranges: 9683055-9885344, 0D000750-0G290584
Mercury Marine	45 JET	45	2-Stroke	2000–2000	27-812868	Serial ranges: 9885385-9973099, 0G290585-0G589999
Mercury Marine	45 JET	45	2-Stroke	2000–2004	27-812868	Serial ranges: 9973100-0P016999, 0G590000-0G760299
Mercury Marine	45 JET	45	2-Stroke	2004–2008	27-812868	Serial ranges: 0P017000-0P094499, 0G760300-0T129554
Mercury Marine	50	50	2-Stroke	1998–2000	27-812868	Serial ranges: 9683055-9885344, 0D000750-0G290584
Mercury Marine	50	50	2-Stroke	2000–2000	27-812868	Serial ranges: 9885345-9973099, 0G290585-0G589999
Mercury Marine	50	50	2-Stroke	2000–2004	27-812868	Serial ranges: 9973100-0P016999, 0G590000-0G760299
Mercury Marine	50	50	2-Stroke	2004–2006	27-812868	Serial ranges: 0P017000-0P325499, 0G760300-0T979999
Mercury Marine	50	50	2-Stroke	2006–2009	27-812868	Serial ranges: 0P325500 & Up, 0T980000 & Up, 1B000001 & Up
Mercury Marine	55	55	2-Stroke	1998–2000	27-812868	Serial ranges: 9741042-9885344, 0D000750-0G290584
Mercury Marine	55	55	2-Stroke	2000–2000	27-812868	Serial ranges: 9885345-9973099, 0G290585-0G589999
Mercury Marine	55	55	2-Stroke	2000–2004	27-812868	Serial ranges: 9973100-0P016999, 0G590000-0G760299
Mercury Marine	55	55	2-Stroke	2004–2006	27-812868	Serial ranges: 0P017000-0P325499, 0G760300-0T979999
Mercury Marine	55	55	2-Stroke	2006–2009	27-812868	Serial ranges: 0P325500 & Up, 0T980000 & Up
Mercury Marine	60	60	2-Stroke	1998–2000	27-812868	Serial ranges: 9683055-9885344, 0D000750-0G290584
Mercury Marine	60	60	2-Stroke	2000–2000	27-812868	Serial ranges: 9885345-9973099, 0G290585-0G589999
Mercury Marine	60	60	2-Stroke	2000–2004	27-812868	Serial ranges: 9973100-0P016999, 0G590000-0G760299
Mercury Marine	60	60	2-Stroke	2004–2006	27-812868	Serial ranges: 0P017000-0P325499, 0G760300-0T979999
Mercury Marine	60	60	2-Stroke	2006–2009	27-812868	Serial ranges: 0P325500 & Up, 0T980000 & Up
Mercury Marine	60 BIGFOOT	60	2-Stroke	2000–2004	27-812868	Serial ranges: 9973100-0P016999, 0G590000-0G760299
Mercury Marine	60 BIGFOOT	60	2-Stroke	2004–2006	27-812868	Serial ranges: 0P017000-0P325499, 0G760300-0T979999

Technical Specs

Product Type: Reed Block Gasket
Installation: OEM specification
Housing Material: OEM-grade gasket material
Dimensions: 300 × 135 × 1 mm
Weight: 0.014 kg (0.03 lb)
Warranty: OEM factory warranty
Other Technical Attributes: Genuine Mercury Marine factory OEM part

What’s in the Box

1 x GASKET (27-812868)

Installation Notes

Ensure the engine is off and cool, and disconnect the battery as a safety precaution.
Remove the engine cover, carburetors, and any other components obstructing access to the reed block assembly.
Carefully unbolt and remove the reed block.
Remove the old gasket and thoroughly clean any residue from the mating surfaces on both the engine block and the reed block. A plastic scraper and a suitable solvent are recommended.
Place the new gasket into position, ensuring it aligns perfectly with the bolt holes.
Reinstall the reed block and tighten the bolts in a crisscross pattern to the manufacturer's specified torque to ensure an even seal.
Reassemble all previously removed components, reconnect the battery, and test the engine for leaks and proper operation.

Troubleshooting & FAQ

How do I confirm this gasket fits my specific engine model?

The best way is to match your original part number to 27-812868. Alternatively, check the extensive Engine & Model Compatibility table on this page. Pay close attention to your engine's model, year, and serial number range to ensure a correct fit.

What are common symptoms of a failed reed block gasket?

A bad gasket can cause a vacuum leak, leading to symptoms like a rough or unstable idle, difficulty starting, engine backfiring (especially through the carburetor), and a noticeable loss of power and acceleration.

Is this a difficult part to replace myself?

For those with mechanical experience, it's a straightforward job. However, it requires removing the carburetors and ensuring the mating surfaces are perfectly clean. If you are not comfortable with this process, professional installation is recommended to prevent improper sealing.

OEM vs. Aftermarket?

This listing is an aftermarket replacement (not OEM). Built to OEM-level specifications with comparable materials. Manufactured in an ISO 9002 facility, batch-inspected for consistency.

Shipping speed & cost

We ship worldwide quickly—typical transit 5–15 days. Standard shipping is free; expedited options appear at checkout where available.

Warranty & returns

Covered by a 1-year warranty against manufacturing defects under normal use. If issues arise, contact support with your order details. Returns are accepted within our standard window (unused & in original condition). See our policy page or reach out for instructions.

Safety & Important Info

Verify images/specifications vs your original part. If anything differs—even if your model appears compatible—do not purchase.
This is an aftermarket replacement, not an OEM component.
Professional installation is recommended for safety and performance.

About Sea Sierra

Pro-Grade Standards — We supply marine parts engineered to OEM-level tolerances and tested for real-world conditions.
Fast Global Fulfillment — Free standard delivery to most regions in 5–15 days.
Manufacturer-Direct Value — Fair pricing without compromising on materials or QC.

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